Adjustment for piano actions



Jan. 15, 1929. 1,699,465

v R. EDWARD ADJUSTMENT FFoR PIANO muons Filed NovL'8, 1926 ago: as

Patented Jim.'15, 1929.

UNITED ST TES rzrra n'r OFFICE.

ROBERT EDWQIRD, OF DULUTH, MINNESOTA.

amnsrunnrr was PIANO ACTIONS.

Application filed November 8 1926. Serial Ne. 146,957.

This invention relates to adjustments for piano actions, the principal ob ect being to provide simple, convenient and positive like parts:

Figure 1 is a perspective view of a drag mental portion of one corner of a grand piano; and

Figure 2 is a vertical section through the center of the improved adjustment for the action taken on line 2--2, Fig. 1.

1 represents the key bottom of the piano and 2 the no; side arm thereof, while a represents the adjustable key frame as commonly found in such pianos,.said frame moving horizontally with the keys when operated by the sound varying pedals as is common in grand pianos. 4 represents the keys of the piano, the 5 the hammers thereof, the face of which are covered with felt for engagement with the strings. It is well known to those versed in the art that the felt upon the hammers, after continued use, becomes grooved by constant contact with the strings in the same spot. To avoid'this grooving and early hardening of the felt by such repeated contact in the identical spot, I have provided means for varying the throw of the action by installing the ad'usting externally screw threaded bolt 6 within the arm 2, opposite the side of the key frame.

This installation comprises preferably a plate 7 with ,a central projecting hub portion 8,.which is inortised into the inner wall ofthe arm 2, the hole in said plate being internally screw threaded for the reception of the adjustingbolt 6, and a hole 9 is-borcd entirel through the arm 2for registration with t e hole in the plate 7 so that the bolt piano as for example by a screw driver manipulating the bolt through thehole; it being desirable to avoid any projection from the side of the arm, as is obvious. The plate 7 may be secured within its mortise by any desired arrangement or screws, and, in the preferred engagementof the end of the aid-- justing bolt 6 with the side of the he frame 3, I install a snrin gpiip 10 which 15 ofi'set ,6 may be readily adjusted externally. of the intermediate of i ts'ends, the supporting end being illustrated at 11 and fastened as by screws to" the inner face of the arm 2 in the same horizontal plane with the bolt- 6, fresulting in the'opposite end as illustrated at 12 overlapping the end oi: the adjusting screw 6, so that the screw at all times engages one side of the offset free end of the clip 10, the other side engaging the side of the key frame 3 when the latter is adjusted for such engagement, which occurs during the normal operation of the piano when nopedals are employed. The principal object 01" the clip 10 is to permit of the convenient removal or installation of the action without frictionally engaging the end of the adjusting bolt 6."

From the above it is a parent that when it is desired to varyor cl relation of the hammers with the strings, the same may be readily accomplished by longitudinal adjustment of the screw 6.

Having thus described my invention, what v.I claim and desire to secure by Letters.

Patent, is:

1. A piano action adjustment comprising an adjustable screw installed within the side of the piano adjacent the action, and a. spring like member also installed upon the side of the piano adjacent the screw and interposed between it and the action. v

2. A piano action adjustment of the char acter described comprising an adjustable screw threaded member, and a fixed yieldable wearing plate interposed betweenthe end of the member and the action.

In testimony whereof I aftix my signature.

ROBERT EDWARD.

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